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Semiconductors

Any solid material with electrical conductivity due to electron flow (as opposed to ionic conductivity) of a magnitude between that of a conductor and that of an insulator.

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Alcoholism

Health care; Cancer treatment

A chronic disease in which a person craves drinks that contain alcohol and is unable to control his or her drinking. A person with this disease also needs to drink greater amounts ...

Atoroidal surface

Eyewear; Optometry

Surface having mutually perpendicular principal meridians of unequal curvature, of which the cross-section in at least one principal meridian is not circular.

Back vertex focal length

Eyewear; Optometry

Distance in an optical system from the back surface to the focal point measured along the optical axis (axis of symmetry).

Auxiliary lenses

Eyewear; Optometry

Additional corrective lenses to facilitate access to higher refractive powers without an excessive numbers of lenses.

Balancing lens

Eyewear; Optometry

Lens fitted to a spectacle frame or mount to balance the weight and/or the appearance of the other lens.

Atoric lens

Eyewear; Optometry

Lens with astigmatic power in which at least one principal meridian is not spherical.

Back surface

Eyewear; Optometry

That surface of the spectacle lens intended to be fitted nearer to the eye.

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